爆堆块度分布对孔隙结构分形特征影响研究

doi:10.3724/1000-6915.jrme.2024.0472

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Abstract To investigate the correlation between fragment size distribution and the internal pore structure of muck-piles，Nuclear Magnetic Resonance(NMR) testing was employed to measure and image the pore structure of muck-pile analogues. The complexity of the internal pore structure within these models was quantified and analyzed using the Box-counting method，revealing the underlying patterns of muck-pile fragment size distribution. Through simulations and indoor analogue experiments，the distribution of internal pore structures within muck-piles was elucidated. The results indicate that：(1) compared to intact rock，the porosity of granular materials(muck-pile constituents) is significantly higher，reaching a maximum of 81.55%. The connectivity of pores within larger gravel particles is superior，with the ratio of small and medium pore T2 spectrum peak areas to the total peak area exceeding 80%. The size of gravel particles significantly influences the number of pores and the pore size distribution in granular materials. (2) The internal pores of granular materials adhere to fractal principles. The standard deviation for extremely small-sized gravel specimens exceeds 0.01，and the fitting values of the fractal dimension R2 for these specimens consistently fall below 0.9，suggesting a close relationship between the uniformity of internal pores and the content of extremely small-sized gravel. (3) Granular materials exhibit a sedimentation effect，with extremely small-sized particles accounting for over 90% at the ends of the specimens，resulting in a distinct stratification phenomenon. By integrating on-site mine observations with simulated muck-pile fragment size distributions，the vertical distribution pattern of“from low to high and from small to large”within muck-piles was verified. The sedimentation effect of extremely small-sized gravel significantly impacts the fragment size distribution of muck-piles.

Key words： mining engineering block distribution nuclear magnetic resonance fractal characteristics pore structure deposition effect

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	CUI Zhesen1
	CHAI Qingping2
	LIU Zhilong3
	WANG Xuesong4
	YUAN Zengsen1
	XU Zhenyang1
	5
	6

Cite this article:

CUI Zhesen1,CHAI Qingping2,LIU Zhilong3, et al. Study on the influence of fragmentation distribution of blasting heap on fractal characteristics of pore structure[J]. , 2025, 44(S1): 134-145.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0472 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/IS1/134

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